When a mysterious woman saunters into his office and begs him to help her find a missing person—herself—detective Frank Orpheus is intrigued on more than just a professional level.

The perplexing puzzle of his client’s lost memory is the most interesting case he’s gotten in years . . . and the fact that she’s rich and gorgeous doesn’t hurt his enthusiasm, either. Despite dire warnings from his devoted and prescient secretary Cass, Frank takes the job. But even as his fascination with the mysterious Lady in Gray flares into passion, Frank finds himself drawn into a shadowy underworld populated by devilish dilettantes and notorious criminals, all of them the puppets of the cryptic crime lord known only as Mr. Menace.

As Frank uncovers the clues that might lead him at last to the Lady in Gray’s lost identity, he learns that her world holds dangers far more diabolical and deadly than knife-wielding thugs and insidious criminal syndicates. His obsession with his strange client could get Frank and the people he cares about killed—or worse.

The closer Frank gets to finding the answers he’s determined to unearth, the more he suspects the truth might be too terrible to live with. Just who—and what—is this woman he’s fallen for . . . and how hard will the fall finally be?